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day 10 solution, helped by reddit

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Andrew Coleman 2017-12-25 16:19:32 -05:00
parent c35022d195
commit 09386dadcb
1 changed files with 58 additions and 0 deletions

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day10/day10.py Normal file
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from time import time
def reverse(text, repeat):
knot = list(range(256))
pos = 0
skip = 0
for isntevenused in range(repeat):
for i in text:
temp = []
for j in range(i):
temp.append(knot[(pos+j) % 256])
for j in range(i):
knot[(pos+i-1-j) % 256] = temp[j]
pos += skip + i
skip += 1
return knot
def dense(knot):
dense = [0]*16
for i in range(16):
dense[i] = knot[16*i]
for m in range(1, 16):
dense[i] ^= knot[16*i+m]
return dense
def kh(dense):
knothash = ''
for i in dense:
if len(hex(i)[2:]) == 2:
knothash += hex(i)[2:]
else:
knothash += '0' + hex(i)[2:]
return knothash
start = time()
inp = '102,255,99,252,200,24,219,57,103,2,226,254,1,0,69,216'
text = [102,255,99,252,200,24,219,57,103,2,226,254,1,0,69,216]
text2 = []
for i in range(len(inp)):
text2.append(ord(inp[i]))
text2 += [17, 31, 73, 47, 23]
knot = reverse(text, 1)
sparce = reverse(text2, 64)
dense = dense(sparce)
knothash = kh(dense)
print('Part One: ' + str(knot[0]*knot[1]))
print('Part Two: ' + knothash)
print('Completed in ' + str(time() - start) + ' seconds.')